36 lines
901 B
Plaintext
36 lines
901 B
Plaintext
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The requirement for a final <code>default</code> clause is defensive programming. The clause should either take appropriate action, or contain a suitable comment as to why no action is taken. Even when the <code>switch</code> covers all current values of an <code>enum</code>, a <code>default</code> case should still be used because there is no guarantee that the <code>enum</code> won't be extended.
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== Noncompliant Code Example
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----
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int foo = 42;
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switch (foo) // Noncompliant
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{
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case 0:
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Console.WriteLine("foo = 0");
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break;
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case 42:
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Console.WriteLine("foo = 42");
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break;
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}
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----
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== Compliant Solution
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----
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int foo = 42;
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switch (foo) // Compliant
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{
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case 0:
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Console.WriteLine("foo = 0");
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break;
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case 42:
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Console.WriteLine("foo = 42");
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break;
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default:
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throw new InvalidOperationException("Unexpected value foo = " + foo);
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}
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----
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include::../see.adoc[]
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